posture and exercises to improve the straightness of the spine
Work placement report: Recruitment in Thang Long postal insurance company and recommendations to improve the quality of recruitment
... •Analysis and synthesis materials, reports in the company •Observation, and interviews for information Scope of the study •Focuses on the situation of recruitment and gives recommendation to improve the ... effectiveness of recruitment PART I: A PRESENTATION OF THE COMPANY AN OVERVEW OF THE POS AND TELECOMMUNICATION JOINT STOCK INSURANCE CORPORATION Full Name: Pos and Telecommunication Joint Stock Insurance ... •Send to director their report after training EVALUATING SITUATION OF RECRUITMENT AT PTI THANG LONG ACHIEVEMENTS IN RECRUITMENT LIMITATIONS AND MY RECOMMENDATI ON TO IMPROVE THE QUALITY OF RECRUITMENT...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 1 ppt
... capability of DFIG is limited by: • stator current (heating of stator coils), • rotor current (heating of rotor coils), and • rotor voltage (limiting the rotor speed) The GSC could be used to control the ... operation, location and optimal size of these units The main reason is because of their ability to reach a satisfactory solution of the problem; furthermore they are very fast and they have low computation ... related to voltage variation and harmonic distortion in the network However, the incorporation of wind energy in power networks could affect the quality of the supplied voltage to the customers To...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 2 potx
... determined by the intersection point of the P- locus, the Q locus and the BL In other words, if the intersection point of the P-locus with the BL and the intersection point of the Q-locus with the border ... affect the supplies and price of oil On the other hand the growing need for energy consumption cannot be stopped or even limited as it is directly related to the rate of development and the standard ... Power System and Alternatives to Improve the Integration maximum voltage limit line At D, the thermal capacity of the line connecting the WF to the system is reached From D to E, only the thermal...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 3 pot
... connected to the grid, the problems originated by the fluctuations in the power output of these generators (and therefore in the voltage, resposible of the flicker phenomenon) began to be a matter of ... is the rated power of the wind turbine and Sk,fic is the short circuit power of the fictitious grid Continuing with the standard, for the test of the turbine, the temporal series of voltage and ... of the network are the active and reactive power exchanged between the generator and the network (after taking into account the compensation by the capacitor), the equivalent impedance of the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 4 potx
... semiconductor layers, conductors made up with crown of strands or the fill between conductors Due to the impossibility to fill in directly the data of the cable to the PSCAD software, the physic ... l is the length of the cable, D is the diameter of the conductor, ρc is the resistivity, ω is the angular speed of the current (2πf), μ is the absolute magnetic permeability of the conductor (μ0 ... independent to the location of the wind turbine However, the second group of these frequencies less attenuated is in function of the location of the wind turbine Thus, in function of the location of the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 5 pptx
... is the voltage, P is the real power, X is the sum of the stator and rotor reactances, Xc is the reactance of the capacitor bank, Xm is the magnetizing reactance, and R is the sum of the stator ... affects the control of the grid and the delivery of the stable power The introduction of large amounts of wind power into the grid increases the short-term variability of the load as seen by the ... dynamic models The simulation of the power network will allow analyzing the effects of the plants proposed depending on the time The evaluation of the parameters of the network in the time will...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 6 docx
... Sinf )} (17) The stock state of the basin at the beginning and at the end of the day must respect the limits of maximum and minimum filling of the reservoir defined in the macroplan of operation ... and demand loads, the best compromise towards the power demand and the amount of energy to be delivered This is to minimize the total operating costs while ensuring the safe operation of the system ... one of the highlights point of the "polytope" formed by the constraints and bounds of variables Therefore, after building the region of feasible solutions, it suffices to inspect the vertices and...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 7 pot
... are the excitation field voltage (Efd) of the SG and the direct-current set point (Iref) of the converter The measurements are the voltage amplitude (Vb) and the frequency (f) of the AC bus The ... input to the controller consists in the difference between the maximum output power from the WES and the output power from the asynchronous link and, the derivative of this difference The output of ... based on the idea that the control system has to maintain the output power value to the nominal value of the generator The torque at the turbine shaft neglecting losses in the drive train is given...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 8 pot
... System and Alternatives to Improve the Integration switches The rating of the converter system in this topology corresponds to the rated power of the generator plus losses The presence of such ... controls the speed of the generator and the power flow to the grid The full-scale frequency converter system consists of a back -to- back voltage source converter (generatorside converter and the grid-side ... penetration of wind power is around 30% -40% of the load In order to allow both the evaluation of the dynamic behaviour of autonomous systems after severe disturbances (e.g ability of the system to restore...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 9 potx
... coupling of the rotational speed of the WT and the system frequency and of the lower inertia constant of the WT compared to a standard conventional generator connected to the grid However, in the ... determined from the total angular momentum of the WT – thus the sum of the angular momenta of the electrical generator, the rotating blades and the gearbox – and the rotational speed There are some ... depending on the so called inertia of the system thus the total angular momentum of the system which is the sum of the angular momenta of the rotating masses in the system i.e generators and spinning...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 10 pot
... related to the first moment of the error, therefore they are related to the generated power, but the values of RMSE and SDE are related to the second order moment and the variance of the error All the ... due to the efficiency of the storage driver The use of the storage system provides more quality in the power fed to the grid, at the cost of lower amount of feed energy The more quality, the less ... term to correct the states of bias The TSO block is mainly a logger of the power feed to the grid It detects the in band and out band states according to the Δ parameter, which is defined in the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11 pptx
... induction Generator with SVC/STATCOM There are no significant rotor speed oscillations in the rotor speed of the induction generator with SVC in the network; however the rotor speed increases to 1.26 ... minimizes the voltage /rotor speed oscillations of the induction generator Among series connected FACTS controllers the UPFC damps both rotor angle oscillations of synchronous generators and rotor ... and the transient ratings of the FACTS controller are obtained to stabilize the rotor speed/rotor angle oscillations in a DFIG based wind energy conversion scheme The rotor speed stability of the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 12 potx
... θblade and rotor speed ωrot, are input to the aerodynamic block The output of the aerodynamic model is the aerodynamic torque Trot, which is the input for the transmission system together with the ... on the side of the rotor blade which is not facing the wind This stall prevents the lifting force of the rotor blade from acting on the rotor As the actual wind speed in the area increases, the ... In other words, it will increase the angle of attack of the rotor blades in order to make the blades go into a deeper stall, thus wasting the excess energy in the wind One of the advantages of...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 13 potx
... factor of three; the lengths of lines L18 to L20, L23, L25 to L27 were increased by a factor of four; the lengths of lines L24, L28 to L30, and L32 to L37 were increased by a factor of six The ... capabilities to handle grid faults Another interesting issue is to explore the present controllers in the design of a whole wind farm and the connection of the wind farm at different types of grid and storage ... respectively, x and y are the mean values of the first and second time series, x and y are the standard deviations of the first and second time series, and n is the number of points in each...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 14 pptx
... and by the corresponding rates of the MTBF and MTTR in the case of transitions to and from the Failure state, respectively The MTBF is used for both transitions from the On and Off states The rates ... performed in order to show the abilities of the model, to the analyse the results and asses the performance of the simulations The first two studies were both simulated for a period of 24h The difference ... Cut-off: for v > vcut−o f f The transitions between the states are smooth because of the technical characteristics of the rotor and generator in the real curve The most interesting state to be...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 8 doc
... it is about the 1/3 of the available energy in the site The use factor UF varies from 23 to 28% according to the type and place of the aerogenerator It is about 25.87% on average for the whole ... Historical sources relate the construction of the first windmill within the territory of the Czech Republic to the year of 1277, namely in the garden of the Strahov Monastery in Prague The oldest reference ... aerodynamic efficiency of rotor To optimize this efficiency, the control of the aerogenerator must be made so that the rotational rotor speed adapts to the site wind speed 5.4 Use factor and availability...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 9 doc
... on the conservation of nature and landscape Therein, the face of the landscape is defined (§ 12) as a natural, cultural and historic characteristics of a particular site or region The face of the ... solely the protection of the face of the landscape which makes the core of their protection Visualization of wind farms is usually processed by means of computer animation and making use of photographs ... photographs of the existing landscape in order to assess the impacts on the face of the landscape – See Figure (Lapčík, 2009) Wind Farms and Their Impact on the Environment Fig A view of photo-visualized...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 10 pdf
... 2, the system operator will choose to build on either side of x = (where v( x ) < vmax ) Relative to the case of individual wind developers, the system operator will spread the wind farms farther ... -June of approximately 3-5% by the end of the century There is a slight increase for July and August Overall for the summer, the total values are approximately equal (decreases of 0-1%), but the ... link their efforts to industry needs on trying to model, reproduce, and understand the resource of interest to utilities (e.g., potential electrical production) rather than the more simple and...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11 pdf
... media, since the spatial distribution of the electrical current in the ground and, hence, the depth of investigation depends on the configuration of the array and the spacing of the electrodes ... used to represent the seismic hazard, and its frequency of occurrence does not directly influence the level of the hazard In the other hand, when the probabilistic approach is used, then the ground ... important part of the site investigation The laboratory testing usually begins once the subsurface exploration and tests is complete The first step in the laboratory testing is to log in all of the materials...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 12 doc
... (0.31) due to their effects on energy efficiency, capacity factor and being ever ready On the other hand, land topography and geology (0.25) determines the stability of the wind turbines and technical ... Turkey, in the Law on The Utilization of Renewable Energy Resources For The Purpose of Generating Electrical Energy, there is a special case for the investors in the cost of land In the case of utilization ... But for the site selection, main economic factor is the cost of the land where the wind farm is constructed; because, the cost of land primarily depends on the region, soil condition and the distance...
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